A local farm's collection of unusual structures from a now defunct storybook amusement park.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Medical history with an amazing, if frighting, collection of wax diseases on display.

A medieval village holds a very modern hotel.

Visitors dip into a variety of pools of what was once ice.

A Spanish artist builds his own castle.

A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

Twisted buildings adorn the banks of the Rhine river.

Island of trash twice the size of Texas floats in the Pacific.

An abandoned building that once tightened a power line that stretched across Messina Strait.

This historical theme park celebrates all things noodle.

Walls of stone rise up from sinkholes caused by underwater erosion.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Iconic rock formations that allow for exploration during high or low tide.

Model Trains and Much More in Hamburg.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Only two of these trees remain in the natural world, found high in the cloud forest of the island of Mauritius.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A showcase of canine neckwear spanning five centuries of doggie fashion and function.

This everlasting lightning storm may be the world's largest generator of ozone.